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Experimental investigation of conditions of lateral shear reinforcements in RC columns accompanied by buckling of longitudinal bars
Author(s) -
Sato Yuichi,
Ko HuneBum
Publication year - 2007
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.712
Subject(s) - buckling , structural engineering , materials science , yield (engineering) , shear (geology) , composite material , deflection (physics) , reinforcement , bar (unit) , geology , engineering , physics , oceanography , optics
This study presents a cyclic load test of four RC columns to obtain data on stresses and strains on lateral shear‐reinforcing bars that contact buckled longitudinal reinforcing bars. The specimens include columns laterally jacketed with all‐elastic fibre‐reinforced polymer (FRP) sheets. The buckling lengths and modes in the longitudinal bars of the four column specimens stabilized at a buckling deflection (= lateral deformation of buckled longitudinal bar) from 0.3 to 0.6 mm. The yield portion ratio r by of shear reinforcement around the buckled longitudinal bars was introduced as an index of the development of buckling conditions. Here, the yield portion ratio r by was defined as the ratio of the length of the region where the shear reinforcements yield l by , to the buckling length l b . The r by values of the tested columns ranged from 0.45 to 0.76. The test results show that the buckling stress and the specific compressive stress of the longitudinal bars in the columns were smaller than those of the bare bars. Copyright © 2007 John Wiley & Sons, Ltd.